Convert Your Mustangs Convertible To A Power Top Neutral Safety

10. At the firewall another drill dimple will be found just to the left of the neutral safety/back up light harness and above the eight-wire connector for the engine wiring. We used a step-drill bit on a 12-inch quick-connect bit extension to carefully drill out the dimple. Pass the under hood harness through the hole and seat the molded grommet into place.